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import time

def fun_bis(num):                                   #裴波那契函数

    result = [0, 1]

    for i in range(num-2):

        result.append(result[-2]+result[-1])

    return result

def main():

    result = fun_bis(20)

    fobj = open('result.txt', 'w+')                 #打开文本文件result.txt

    for i, num in enumerate(result):                #循环打印和保存数列数据

        print("index %d is %d" % (i, num))

        fobj.write("index %d is %d \n" % (i, num))

        time.sleep(1)                               #间隔1秒钟

if __name__ == '__main__':

    main()